Nokia RM-632 Service Manual page 70

Image on the display not correct
Backlight dim or not working at all
Visual defects (pixel)
Item
1 Defect counts
2 Combined
defect counts
Steps
1. Verify with a working display that the fault is not on the display module itself.
The display module cannot be repaired.
2. Check that the cellular engine is working normally.
i To check the functionality, connect the phone to a docking station.
Phoenix service software.
ii Start
iii Read the phone information to check that also the application engine is functioning normally (you
should be able to read the APE ID).
3. Proceed to the display fault troubleshooting flowchart.
Use the Display Test tool in
Page 3 – 28
Table 7 Pixel defects
White dot defect
R G
1 1
Not allowed.
Two single dot defects that are within 5 mm of each other should be
interpreted as combined dot defect.
Phoenix to find the detailed fault mode.
COMPANY CONFIDENTIAL
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BB Troubleshooting and Manual Tuning Guide
Image on the display can be corrupted or a part of
the image can be missing.
• If a part of the image is missing, change the
display module.
• If the image is otherwise corrupted, follow the
display fault troubleshooting flowchart.
Backlight LED components are inside the display
module. Backlight failure can also be in the
connector or in the backlight power source in the
main engine of the phone.
This means that in case the display is working
(image OK), the backlight is faulty.
Pixel defects can be checked by controlling the
display with Phoenix. Use both colours, black and
white, on a full screen.
The display may have some random pixel defects
that are acceptable for this type of display. The
criteria when pixel defects are regarded as a display
failure, resulting in a replacement of the display, are
presented the following table.
B White Dot
Total
1 1
RM-632; RM-634; RM-699
Black dot Total
defect
1 1
Issue 3